The loop to read packets does not take all packets as the number of
available packets (nb_used) is decremented in the loop.
Take all available packets provides a performance improvement of 3%.
Fixes: fc3d66212fed ("virtio: add vector Rx")
Cc: sta...@dpdk.org
Cc: thibaut.col...@6wind.com
Cc: maxime.coque...@redhat.com
Cc: tiwei....@intel.com
Cc: zhihong.w...@intel.com
Cc: jer...@marvell.com
Cc: gavin...@arm.com
Signed-off-by: David Christensen <d...@linux.vnet.ibm.com>
---
drivers/net/virtio/virtio_rxtx_simple_altivec.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/net/virtio/virtio_rxtx_simple_altivec.c
b/drivers/net/virtio/virtio_rxtx_simple_altivec.c
index f856396ab..47225f412 100644
--- a/drivers/net/virtio/virtio_rxtx_simple_altivec.c
+++ b/drivers/net/virtio/virtio_rxtx_simple_altivec.c
@@ -44,7 +44,7 @@ virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf
**rx_pkts,
struct virtnet_rx *rxvq = rx_queue;
struct virtqueue *vq = rxvq->vq;
struct virtio_hw *hw = vq->hw;
- uint16_t nb_used;
+ uint16_t nb_used, nb_total;
uint16_t desc_idx;
struct vring_used_elem *rused;
struct rte_mbuf **sw_ring;
@@ -109,9 +109,10 @@ virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf
**rx_pkts,
virtqueue_notify(vq);
}
+ nb_total = nb_used;
ref_rx_pkts = rx_pkts;
for (nb_pkts_received = 0;
- nb_pkts_received < nb_used;) {
+ nb_pkts_received < nb_total;) {
vector unsigned char desc[RTE_VIRTIO_DESC_PER_LOOP / 2];
vector unsigned char mbp[RTE_VIRTIO_DESC_PER_LOOP / 2];
vector unsigned char pkt_mb[RTE_VIRTIO_DESC_PER_LOOP];
--
2.18.1
